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(No Model.) 3 Sheets-Sheet I.

B. HOLMES.

MAGHINE FOR GRINDINGPSTEEL BARS. No. 248,744. Patented Oct. 25,1881

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(No Model.) 3 SheetsSheet 2.

B. HOLMES.

MACHINE FOR GRINDING STEEL BARS. No. 248,744. PatentedOot. 25,1881.

Witnesses lnvenfi or (No Model.) 3 SheetS- Sheet 3.

B. HOLMES.

MACHINE FOR GRINDING sTBEI. BARS. No. 248,744. Patented 0015.25, 1881.

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UNTTED STATES PATENT @FFTQE.

BRITAIN HOLMES, OF BUFFALO, NEWT YORK, ASSIGNOR TO HIMSELF AND EDW'ARDHOLMES, OF SAME PLACE.

MACHINE FOR GRINDING STEEL BARS.

SPECIFICATION forming part of Letters Patent No. 248,744, dated October25, 1881.

Application filed May '7, 1881. (No model.)

To all whom it may concern:

Be it known that I, BRITAIN HOLMES, a citizen of the United States,residing in Buffalo, in the county of Erie and State of New York,

have invented certain new and useful Improvements in Machines forGrinding or Planing Hard Steel Bars or other articles, of which thefollowing is a specification.

The object of my invention is to produce a machine for grinding a trueor plane surface on hardened steel bars, planer-knives, or otherarticles requiring their sides or other parts to be readily brought to astraight or plane surface; and it consists, first, in the combination ofa suitable grindstone, emery, or other wheel with a table having acurved downward and upward movement, and a horizontally-movable tablefor holding the bar or other article to be ground, the arrangement beingsuch that the combined action of the table having the curved up and downor vibrating movements and the horizontally-movable table allows thearticle to be ground straight in the direction of its width and also inthe direction of its length.

The second part of my intention consistsin the combination, with the upand down movable table, of a suitable means, as will be more clearlyhereinafter shown, for moving it to or 0 from the grinding-wheel, thesaid table being connected to a shaft so as to receive its up and downswinging or vibrating movements by means of said shaft as a center toswing on, which shaft is capable of an easy longitudinal 5 adjustment,the object being, first, to provide the means for easily adjusting saidtable to or from the stone while in operation, according to thethickness of the article to be ground or the thickness it may be desiredto grind the article; second, a further means for adjusting the table asthe stone wears away.

The third part of my invention relates to the means for adjusting thelength of the up and down curved movements of the table, so as to 5regulate its movements to articles of difi'erent widths, all of whichwill be more clearly understood by reference to the drawings, in which-Figure 1 is afront elevation of the machine;

. Fig. 2, an enlarged side elevation of the device for adjusting thedistance of thetable to or from the grinding-wheel while the same is inoperation. Fig. 3 is a plan or top view of the apparatus; Fig. 4, adetached view, showing a side elevation of a portion of the device,partly in section, for adjusting the length of the upward and downwardmovements of the table. Fig. 5 is a side elevation, partly in section,through line X X, Fig. 1, and Fig. 6 represents a horizontal sectionthrough a portion of the device for adjusting the distance of themovable tables to or from the grindingwheels while the same is inoperation.

Arepresents the grindstone. ltis supported by a shaft, A, set on a frameor support, A in boxes a a, in the usual way, and it is provided withthe ordinary tight and loose pulleys, B B, for driving it.

0 represents the main frame or base, of hard wood or other suitablematerial. It is put togeth er in the usual way, so as to be strong andsecure.

The vibrating or swinging table 0 is jointed to the frame 0 by a strongshaft, set in boxes I), (see Fig. 3,) which shaft 0 is rigidly fastenedto the back end, 0 of the table 0 by a. key or other well-known device,and is made long enough and arranged in the boxes I), so as to becapable of a longitudinal and also a rocking movement, and therebyafford the means for giving the table 0 its necessary movements andadjustments. The table 0 receives its up and down swinging curvedmovements by means of a rocking beam, D, resting on a fulcrum, D, thefulcrum being adjustable back and forth along the racks b (which racksare set upon a foundation made in any wellknown way) by means of thepinions c 0 (see Fig. 3) and the pinion D (see Figs. 3 and 4.) Thepinion D is fitted into asuitableholdingpiece, (I, provided with a leveror arm, 0 and arranged so as to turn easily on the shaft or fulcrum D.The lever c is made movable longitudinally a sufficient distance toallow its lower end, d, to engage with the teeth in the pinion D asshown by the dotted lines (1 in Fig. 4, or to be disengaged therefrom bywithdrawing it from the teeth in the pinion.

E represents an upright supporting-bar, the

lower end of which rests in a concave or depression, e, in the slidingblock 0. (See Fig. 5.) The upper end is also set in a similar depressionin a block, E, secured to or forming a part of the table C, so that theweight of the table keeps it in place. The upper part of the bar E ismade adjustable in the direction of its length by means of the screw 0and nut 0 for the purpose of adjusting the height of the table 0.

The beam D receives its oscillating movements from a pinion, F, fastenedto the shaft A, and a spur-wheel, F,rigidly secured to the shaft F whichshaft is set in suitable bearings,f, and provided with an eccentric,f,arranged within a y0ke,f on the beam D. The lower portion of theeccentric is set in an oilpan, g. (See Fig. 5.)

It will now be seen that as the pinions c 0 gear into the racks b thefulcrum or shaft I) may be moved back and forth along the said racks,whereby the length of the oscillating movements of the end D of the beamD and the upward and downward movements of the table 0 maybe regulatedor made greateror less, according to the width of the article to beground.

The object of the up and down movements of the table 0 is to impart thenecessary transverse movement to the article to be ground, whereby itswhole width is made true.

The mechanism for giving the article to be ground a longitudinalmovement, so that it may be made straight in the direction of itslength, consists of a table, G, resting upon the table G upon rollers JJ, (see Fig. where one of the covers J of the upper roller, J, is shownin section, so as to show the roller. The under part of the table G isprovided with wheels K, arranged within the waysjj, and to the frontplate, G, which forms apart of, or is securely fastened to, the table G,is attached in any well-known way the rollers J, and on the bottomplate, G which is a part of G, or is firmly fastened to it, are tworollers, K, arranged between the ways Z I. It will be noticed that bothends of the table G are provided with the above-mentioned wheels orrollers, so that both ends will be supported and held closely to thetable 0 and yet be capable of a free and easy movement along the same.The upper rollers are covered by covers J 3 J The table G is moved byhand back and forth along the table 0, while grinding a bar or otherarticle, by means of the handles N N The mechanism for readily movingthe table 0 to or from the stone while grinding a bar or other similararticle, so as to adapt it to articles of different thicknesses and forany slight wearing away of the grinding stone or wheel, is constructedas follows:

H represents an iron frame secured to a block or other support by bolts,so that it may move forward when necessary, and fastened by bolts, or inany well-known way, and is provided with the ordinary bearings for thebevel-gear wheels H 11 To the gear-wheel H is securely connected ashaft, I, supported at its outer end in an upright bar, I, and providedwith a hand-wheel, 1 for turning it.

The bevel-wheel 11 which acts as a screwnut, is inclosed between twovertical supports, L L, which have openings for the bar L to passthrough. The front end, m, of the bar L" is made square or of any othersuitable form, and passes through a corresponding opening in thevertical frame-piece at, so as to prevent it from turning therein. Theother portion of the bar is made round and provided with a screw-thread,M, which passes through andfits the thread in the nut or bevel-wheel HTo the front end of the bar or shaft L is securely connected a block, M,(see Figs. 5 and 6,) which block is arranged to fit closely and slide ina case, N, which case is securely fastened to the table 0 by bolts, andhas an open side to receive the said block. In Fig. 5- a back view ofthe block it is shown, and atop view in Fig. 6: also a portion of theliar L attached to it. The case N should be in the form of a curve theradius of which would start from the center of the shaft 0 By thisconstruction it will be seen that by turning the hand-wheel I the bar Lwill be moved longitudinally, and that, as the frame H is rigidly heldto the frame-work below it, and the table (3 being connected by a block,M, as before mentioned, the table will be moved to or from thegrinding-wheel, according to the direction in which the hand-wheel I maybe turned. As the grinding-wheel wears away, so as to be beyond thereach of the movements controlled by the hand-wheel 1 the table 0 ismoved toward it by sliding the shaft 0 forward in the boxes I), and ifthe first box 0 should be in the way it can be moved to the holes h h.At the same time the block 0 should be moved in the same direction alongthe beam D on the ways 9, so as to be vertical, or nearly so, under thetable 0. The block 0 is held in place when so moved by means of abar, 1which passes through a staple, i, and is provided with perforations gand when in the desired position it is held in place by two pins, t",which are passed through a perforation, one on each side of the staple,(see Fig. 3,) thereby holding it securely until the grinding-wheel wearsaway enoughto require a further movement forward.

It will also be noticed that as the table 0 is moved toward thegrindstone in this way, the frame Hand its mechanism, and block on whichit rests, should be loosened and moved forward and securely bolted inplace.

0 (see Fig. 1) represents a counter-weight, suspended to one end of abeam, 0, which beam is suspended on any suitablejoint, P, near theceiling, or some other convenient place. The opposite end of the beam isprovided with a rod, 1?, the lower end of which connects with the hook Qon the outer end of the table 0. The object of the weight 0 is tocounterbalance the weight of the table 0, so it will work easier.

The bar to be ground-the cutter'bar It, for

instance (shown in Fig. 2)is placed on the bar It, which is arrangedclose to the face of the front of the table G, so as to be moved up ordown, when required, by means of the screwrods S Sand their handle nutst t. (See Figs. 1 and 2.) The grinding-wheel holds itwith sufiicientforce in place against the front of the table G, and, the' motion of thestone being in the direction of the arrow, (shown in Fig. 2,) holds itdown firmly to the holding-bar R. During the operation of grinding, thearticle to be ground is forced up against the grindstone by thehandwheel 1 and at the same time the table Gis moved back and forthalong the table 0 by the handles N or N I claim as my invention- 1. Asuitable grinding-wheel, A, supported in the usual hearings, incombination with the table 0, supported in a longitudinally-movablerock-shaft, O and a horizontally-movable table, G, provided with aholding-bar, R, as and for the purposes specified.

2. The case N, secured to the table G, the shaft L held from turning inthe bearing m, as specified, and provided \Vitha screw, 'M,incombination with the bevel-wheel H adapted to fit the screw M andarranged between supports L L, the bevel-wheel H, shaft I, andhand-wheel 1 for the purpose of readily moving the tables 0 and G to orfrom the grinding-wheel, as described.

8. The eccentricf, arranged within a yoke, f on the rocking beam D, thevertical bar E, and table 0, in combination with the movable oradjustable fulcrum D, for the purpose of 35,

operating and adjusting the length of the vertical movements of thetable 0, substantially as described.

4. The combination of the table 0, shaft 0 vertical bar E, sliding blocke, bar 9 staple i, and beam D, for the purpose of adjusting the table 0and its connections as the grindingwheel wears away, as set forth.

5. The verlically-adjustable holding-bar R, in combination with theswinging table 0 and horizontally-movable table G, for the purposesspecified.

6. The rocking bar D and its operating mechanism, supported on afulcrum, 1), made adjustable, substantially as specified, the verticalsupporting-bar E, and table 0, arranged to swing on a shaft,horizontally-movable table G, and the case, N, with its operatingmechanism, the whole being combined for joint operation, substantiallyas and for the purposes described.

BRITAIN HOLMES.

Vitnesses:

EDWARD HoLMEs, JAMES SANGSTER.

